Ventilated Roof Sheathing

When the attic becomes part of the home to be heated and cooled open wall gable vents and roof vents are no longer feasible but the underside of the roof the sheathing and rafters can still.

Ventilated roof sheathing.

The wood spacers shall. If you see dampness or frost you need better roof ventilation and some attic vents. Thermacal 1 and 2 ventilated roof insulation panels are composite ventilated roof insulation panels combining standard osb sheathing an air space made by solid wood spacers and polyisocynurate. A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.

Field monitoring of numerous attics has confirmed that the temperature of the roof sheathing of a unvented roof will rise by a few to no more than 10 f more than a well ventilated attic. 7 16 osb is standard and 5 8 or 3 4 osb or plywood and. The roof sheathing shall be cornell ventilated roof sheathing manufactured by cornell corporation p o. This above sheathing ventilation or asv inherent to tile roof installations can be enhanced using counter battens shims or manufactured systems to raise the horizontal battens above the roof deck.

Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. It shall consist of 7 16 optional 5 8 or 3 4 oriented strand board sheathing with 1 deep wood spacers secured to the underside of each 4 x 8 panel. The amount of cooling provided by a well ventilated roof exposed to the sun is very small. Up to 1 50 ventilation ratios possible with new matrix members.

30 times stronger than equivalent plywood or osb. The map at right which is based on table r806 4 of the irc lists the minimum r values required to prevent condensation in unvented assemblies in various climate zones. Box 33s cornell wl 54732 tele. An unvented roof assembly is possible only if you keep the roof sheathing warm enough to prevent conditioned air from condensing against it.

Integral ventilation provides energy savings and extends the life of roofing and siding. The system design will vary with the environmental challenge and goals. Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing. Save an average of 2 500 in construction costs.

The standard 1 vent space layout leaves over 92 open vent area for maximum airflow. Superior strength reduces framing saving thousands in construction costs. R vent is a 40 recycled ventilation mat used in cedar metal tile roof construction.